Machine-screw.



0 J. L. DE STEIGER.

MAGHINE sonzw. APPLICATION FILED AUG. 5, 1908.

93 3 ,83 1 Patented Sept. 14, 1909.

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UNITED STATES PATENT OFFICE.

JOSEPH L. DE STEIGER, OF LA SALLE, ILLINOIS.

MACHINE-SCREW.

Application filed August 5, 1908.

and is subsequently fixed in a simple but strong and durable manner tosaid major portion.

ith the foregoing in mind, the novelty, utility and practical advantagesof my invention-will be fully understood from the following descriptionand claim when the same are read in connection with the drawings,accompanying and forming part of this specification, in which:

Figure l is a perspective view on an enlarged scale of a machine screwhaving a finger piece permanently connected to its major portion inaccordance with my invention. Fig. 2 is a longitudinal central sectiontaken through the screw in a plane at right angles to the kerf in thehead of the screw. Fig. 3 is a perspective view showing the screwprecedent to the application of the fingerpiece thereto. Fig. a is aperspective view illustrating the finger-piece as the same ap pearsprior to being permanently fixed on the remainder of the screw.

Similar letters designate corresponding parts in all of the views of thedrawings, referring to which:

A is what is commonly known as a machine screw-that is to say, a screwhaving a threaded shank a and a head Z) in which is a kerf c, and B is afinger-piece constructed with a View of being permanently joined withthe screw in accordance with my invention. The said finger-piece B maybe of any configuration and of any material consonant with the purposeof my invention without involving departure from the scope of theinvention as defined in the claim ap pended, though I prefer to make itof about the shape illustrated and to strike it from sheet-metalpossessed of the requisite stiffness and strength.

As clearly illustrated in Figs. 2 and 4:, the

Specification of Letters Patent.

Patented Sept. 14, 1909.

Serial No. 447,059,

finger-piece B is provided with a portion 65 corresponding in width tothe length of the before mentioned kerf c, and is also provided in saidportion d with an aperture 6; and in assembling the parts of my improveddevice the portion cl of the finger-piece is disposed in the kerf c ofthe screw, after which portions of the screw head at opposite sides ofthe finger-piece are displaced and are forced against the opposite sidesof the finger -piece and into the aperture 6 thereof and together withinsaid aperture 6, Fig. 2. As will be obvious this operation may beexpeditiously and easily accomplished and yet it results in thefinger-piece B being fixed in the screw head in the kerf thereof in suchmanner that the finger-piece is strongly held against separation fromthe screw in any direction and at the same time is eifectually preventedfrom working loose or moving with respect to the screw, this being duein large measure to the forcing of the portions of the screw-headtogether in the aperture 6 of the finger-piece. It will further bemanifest that when the screw A and the finger-piece B are joined in themanner described and best illustrated in Fig. 2, the screw or analogousdevice will, as a whole, present the appearance of a device formed inone piece, and will be quite as strong and durable as such a device.

My improvements are designed more especially for incorporation inmachine screws and the like, but I would have it understood that withoutinvolving departure from the scope of my claimed invention, they may beembodied in screws of all kinds, and push pins and other devices.

Having described my invention, what I claim and desire to secure byLetters-Patent, is:

As a new article of manufacture, a device to be driven, comprising ashank, a diametrically-enlarged head formed integral with the shank andhaving a kerf extending throughout its diameter, and adiametricallydisposed finger-piece initially formed separate from theshank and the head thereof and having a transversely apertured portioncZ corresponding in width to the length of the kerf in the head and inthickness to the width of said kerf and also having an outer portion ofgreater width than the portion the said portion 0? of the finger-piecebeing disposed in the kerf of the head with f In testimony whereof Ihave hereunto set its ends flush with the sides of the head, and I myhand in presence of two subscribing ,wit-

portions of the head at opposite sides of nesses.

the portion cl being forced against the sides 1 JOSEPH L. DE STEIGER. 5of said portion and being also forced to- Witnesses:

gether within the transverse aperture 6 in GORNELIA MASON,

the portion cl. ALBERT G. KNIGHTQ

